Knife through the Heart. ( Black butler x Readers x ohshc )

Y/N, the greatest assassin in all of England, has a dark secret. whenever she takes off her pendant, bad things start to happen.
But after the Earl Phantomhive asks her to stay with him after she ran into him, she indulges in the social world she set out to destroy. But soon, she found herself kidnapped by the Earl Trancy, who removed her memory of Ciel and his Butler.
But what happens when her child Hood friends Hikaru and Kaoru come back into the picture, and bring a club of boys with them!? can she keep her assassin side hidden, along with the secret that lies in her special necklace?
Not if her brother keeps butting in...
(endings for, Sebastian, Ciel, Finny, tamaki, the twins, and honey)
thanks for reading!! I own nothing except the plot of the story and my OCs!